<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let persons = [
    {
        username:'张飞',
        sex:'男',
        salary:50000 
    },
    {
        username:'关羽',
        sex:'男',
        salary:60000
    }
]
var newP = persons.map(function(item){
    item.salary = item.salary +800
    return {username:item.username,sex:item.sex,salary:item.salary+800}
})
console.log(newP);
</script>
</body>
</html>